Pressure foot for rib attaching machines



Mar 1964 s. P. LOTARSKI ETAL 3,124,819

PRESSURE FOOT FOR RIB ATTACHING MACHINES 2 Sheets-Sheet 1 Filed Jan. 3, 1963 in van tors I March 17, 1964 s. P. LOTARSKI ETAL 3,124,819

PRESSURE FOOT FOR RIB ATTACHING MACHINES Filed Jan. 5, 1965 2 Sheets-Sheet 2 United States Patent Jersey Filed Jan. 3, 1963, Ser. No. 249,236 4 Claims. (Cl. 12-40) This invention relates to machines for use in making insoles for welt shoes and more particularly to an improvement on the insole rib attaching machine which is the subject of Letters Patent of the United States No. 2,898,614, granted August 11, 1959 in our name.

The insole rib attaching machine of the above-cited patent has performed well for all types and sizes of insoles, as long as it was applying prefabricated rib of the exact design originally contemplated, i.e., prefabricated rib with an inner flange of approximately A1. inch width. Recently, however, the width of the prefabricated rib inner flange has been increased to /2 inch or more. When the insole rib attaching machine was being adapted to this wide-flange rib, trouble was experienced whenever the rib was being laid around pointed toes, of the sort found in the cowboy boot and juvenile pointed toe styles. The presser foot on a /2 inch rib machine requires a flange-engaging toothed grip member inside its notch of at least /2 inch in length. In rounding pointed toes, in the backpart of the turn after the foremost point on the toe has been passed, a presser foot of the type shown in the patent inevitably jams its /2 inch inner grip member against that part of the rib already attached on the front part of the turn. This results in distortion and shrinkage and knocking down of the rib at that point.

An object of this invention is to provide means for adapting an insole rib attaching machine of the type described in Patent No. 2,898,614 to attach wide-flanged ribs to insoles having very pointed toes. Another ob ject is to provide an improved presser foot which will perform properly in all wide-flanged rib applications without having to change any other parts of the abovementioned machine.

In the achievement of these objects, there is provided a new presser foot featuring an inside portion comprising two elements, the one adjacent the notch being fixed and integral with the rest of the presser foot assembly, the other element, which accounts for about the inner two thirds of the inner portion of the presser foot, being hinged to the main presser foot assembly and being held in line with the rest of the grip area by a spring forcing it against a stop. The location of the stop and the strength of the spring are such that the hinged portion can swing inward when the presser foot is jammed back against the already attached rib in a tight turn; otherwise, the foot appears and operates exactly as the presser foot of the patent.

Other features and objects and a fuller understanding of the invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawings in which:

FIG. 1 is a front elevation of a portion of an insole rib attaching machine, upon which the present invention is an improvement;

FIG. 2 is a sectional view through the presser foot of the machine, shown operating around the toe portion of an insole to which a ribbed strip is being attached;

FIG. 3 is an enlarged cross section of a portion of an insole illustrating the ribbed strip attached thereto;

FIG. 4 is a front elevation of the presser foot; and

FIG. 5 is a side elevation of the presser foot.

3, 124,8 1 9 Patented Mar. 1 7, l 964 The machine upon which the present invention is an improvement is fully explained in Patent No. 2,898,614. A presser foot 12 is mounted on the above-mentioned insole rib attaching machine as shown in FIG. 1, where it is fixed to the lower end of a lever 14 which is pivoted at 16 to a slide 18 which moves horizontally in a groove in an arm 20. The arm 24) is fixed to a sleeve 22 on a shaft 24 which has an arm 26 fixed to it through the oscillation of which the up and down movements of the presser foot are imparted. A horizontal movement of the presser foot to impart feeding movement to the insole and the rib strip is achieved by the use of a downwardly extending arm 28 pinned at 30 to one end of a link 32. At the other end of the link 32 is a bracket 34 which is pinned to the lever 14. For more detail as to the machine on which our presser foot is an improvement, the reader is referred to the above-cited patent.

In the operation of the insole rib attaching machine a strip S, which may be precoated with a pressure sensitive cement, is pressed against the margin of an insole I, which may likewise be coated with a similar cement, to cause the strip to be permanently attached thereto to by the presser foot 12 provided in its lower end portion with a slot R to accommodate the rib portion R of the strip. At opposite sides of the slot are two toothed portions 44 and 46 adapted to grip the outer flange F and the inner flange F respectively of the strip.

The larger inner toothed portion 46 is an assembly comprising a fixed grip member 48 adjacent the slot, and a hinged grip member 55), which is pivotally connected to the fixed grip member by a pin 52. A stop 54 mounted on the fixed grip member alines the hinged grip member with the other parts of the toothed portion whenever the hinged grip member is snug against it. A spring 56 holds the hinged grip member yieldingly against the stop at all times during operation of the machine except when the hinged grip member is displaced by portions of the already-laid rib, as shown in FIG. 2.

The new presser foot is attached to the insole rib attaching machine and normally functions therein in the same manner as described in the above cited patent. However, when the presser foot is working around a very pointed toe, as appears in FIG. 2, after it has laid the rib strip up to the point of the toe and has started back, the hinged member 50, to the extent that it is forced to do so by the already-laid rib, is displaced away from the stop 54 against the bias of the spring 56. In this manner the new displaceable presser foot avoids mashing down the already-laid rib around pointed toes permitting the use of the illustrated insole rib attaching machine in making shoes (notably styles in the juvenile area) where such pointed toes appear.

Although the invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

l. A presser foot for an insole rib attaching machine comprising an inner grip member, a displaceable grip member on said inner grip member, said grip members having generally co-planar Work-engaging surfaces, means mounting the displaceable grip member adjacent to the inner grip member for movement into and out of alinement therewith while maintaining its work-engaging surface in the plane of the work-engaging surface of the inner grip member, and means normally maintaining said displaceable member in line with the inner grip member but permitting its displacement upon engagement with a previously formed rib on the insole.

2. A presser foot for an insole rib attaching machine comprising an inner grip member, a hinged grip member on said inner grip member movable about a substantially vertical axis into and out of alinement with the inner grip member, and spring means normallymaintaining said hinged grip member in line with the inner grip member 10 unless displaced by engagement with a previously formed rib on the insole.

3. A presser foot for an insole rib attaching machine comprising an inner grip member, an outer grip member hinged on the inner grip member for rearward pivoting 15 4 said hinged grip member yieldingly against said stop, whereby said hinged grip member is movable rearwardly when contacted by a previously attached portion of the insole rib. v

4. A presser foot for a machine for attaching adhesivecoated ribs to the upper surface of an insole comprising an inner grip member, a displaceable grip member mounted on said inner grip member for rotation about an axis substantially perpendicular to the surface of the insole being worked on at the point where the presser foot is making contact therewith, and means normally maintaining said displaceable member in line with the inner grip member and permitting its displacement upon engagement with a previously attached rib on the insole.

References Cited in the file of this patent UNITED STATES PATENTS 2,147,128 Sailer Feb. 14, 1939 2,706,824 Ridderstrom Apr. 26, 1955, 20 2,907,261 Schrader Oct. 6, 1959 

1. A PRESSER FOOT FOR AN INSOLE RIB ATTACHING MACHINE COMPRISING AN INNER GRIP MEMBER, A DISPLACEABLE GRIP MEMBER ON SAID INNER GRIP MEMBER, SAID GRIP MEMBERS HAVING GENERALLY CO-PLANAR WORK-ENGAGING SURFACES, MEANS MOUNTING THE DISPLACEABLE GRIP MEMBER ADJACENT TO THE INNER GRIP MEMBER FOR MOVEMENT INTO AND OUT OF ALINEMENT THEREWITH WHILE MAINTAINING ITS WORK-ENGAGING SURFACE IN THE PLANE OF THE WORK-ENGAGING SURFACE OF THE INNER GRIP MEMBER, AND MEANS NORMALLY MAINTAINING SAID DISPLACEABLE MEMBER IN LINE WITH THE INNER GRIP MEMBER BUT PERMITTING ITS DISPLACEMENT UPON ENGAGEMENT WITH A PREVIOUSLY FORMED RIB ON THE INSOLE. 